IL91531 Datasheet - IK Semiconductor

IL91531 Parallel Input Tone/Pulse Dialer

Pin No. Designation 1 MODE DESCRIPTION Tone mode select input. When this input is high, the tone output and ASK output are normal. When this input is low, a DTMF signal will be generated continuously and any new input data will be ignored. This input affects the tone output mode only. Latch input. .

TECHNICAL DATA IL91531 PARALLEL INPUT TONE/PULSE DIALER High-Performance Silicon-Gate CMOS The IL91531 provides a 4-bit data input and a handshaking signal to serve as microcomputer interfaces. Under microcomputer control the IL91531 generates both a DTMF signal and a pulse output for telephone dialing. All necessary dual-tone frequencies and dial pulse outputs are derived from the widely used TV crystal standard, providing high accuracy and stability. The required sinusoidal waveform for indi.

IL91531_IKSemiconductor.pdf